perf: make fetch_secrets use cache for performance (#11201) #188

Job	Run time
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[a-k]*)	29m 29s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[l-z]*)	25m 32s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/admin t/cli t/config-center-yaml...	25m 26s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/node t/pubsub t/router t/script ...	25m 15s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[a-k]*)	26m 20s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[l-z]*)	25m 27s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/admin t/cli t/config-center-yaml t/cont...	22m 44s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/node t/pubsub t/router t/script t/secre...	22m 27s
	3h 22m 40s

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